[Free Registration/Login may be required to access all resource tools.] In this online tutorial students will define a mixture and understand why mixtures are different than pure substances. They will classify mixtures as homogeneous or...

[Free Registration/Login Required] Discover the composition of matter and the relationship between matter, atoms, and elements. Students will learn the differences between elements and compounds, and how molecules are formed. Chemical...

[Free Registration/Login may be required to access all resource tools.] In the following online tutorial students will use the oxidation number rules to determine the oxidation number of an atom of any element in a pure substance. They...